Actuator assembly
By introducing a plate-like frame part and web-like extension into the actuator subassembly to transmit axial force and torque, the problem of overloading of the housing in the prior art is solved, and a lower cost and lighter weight is achieved. Actuator subassembly design.
Patent Information
- Application Number
- CN202411128053.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-08-18
- Filing Date
- 2024-08-16
- Publication Date
- 2025-02-21
AI Technical Summary
The loads subjected to existing actuator subassemblies during operation cause the housing to be overloaded, increasing production costs and weight.
By introducing a plate-like frame portion and web-like extension into the actuator subassembly, the axial force and torque are transmitted, thereby reducing the load on the housing.
Effectively reduces the load on the housing, allowing the manufacture of the housing using plastic materials, thereby reducing production costs and weight while improving the resistance capability of the actuator subassembly.
Smart Images
Figure CN119491886A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to an actuator subassembly for a vehicle brake. Background Art
[0002] The actuator subassembly is used in vehicle brakes to apply a brake pad to a brake rotor. To this end, the actuator subassembly generally has a spindle drive having a sliding actuating member and an electric drive spindle for axially moving the sliding actuating member, wherein an axial positioning force for applying the brake pad to the brake rotor is transmitted from the spindle nut to the brake pad.
[0003] The spindle drive is usually accommodated for the most part in the brake caliper in the form of a cast component.
[0004] The spindle drive is coupled to the electric motor via a gear mechanism unit, which is usually accommodated in a plastics material housing that is fixed to the brake caliper, so as to drive the spindle drive. The gear mechanism unit itself is supported on a frame part that is in torque-transmitting engagement with the brake caliper and is axially supported on the housing.
[0005] The torque generated when the sliding actuating member moves is therefore directly transmitted to the brake caliper, while the axial force is transmitted to the brake caliper via the housing. Therefore, the housing is subjected to a large load.
[0006] It is also conceivable to manufacture the housing for the gear mechanism as a cast component. However, this would have an adverse effect on the production costs and weight of the actuator subassembly.
[0007] It is therefore an object of the present invention to provide an actuator subassembly which is improved in its resistance capacity to the loads occurring during operation. Summary of the invention
[0008] According to the invention, this object can be achieved by an actuator subassembly for an especially electric vehicle brake, which has a brake caliper in which an intermediate space for receiving a brake rotor is provided, a spindle drive having a sliding actuating member for applying a brake pad to the brake rotor and an electric drive spindle for axially moving the sliding actuating member, an electric motor, which is drivingly coupled to the spindle via a gear mechanism unit, a housing, which accommodates the gear mechanism unit, and a plate-like frame part, which has a receiving space for receiving at least one gear stage of the gear mechanism unit and which is also arranged in the housing. Starting from the frame part, at least one web-like extension extends in the direction of the brake caliper and is fixed to the brake caliper.
[0009] An advantage of the actuator subassembly according to the invention is that axial forces are introduced from the frame portion via the web-shaped extension into the brake caliper without the housing accommodating the gear mechanism unit being overloaded. In particular, during operation of the actuator subassembly, torques and axial forces are mainly transmitted to the brake caliper. As a result, the housing can be produced from a plastic material, whereby it can be produced in a cost-effective manner.
[0010] The web-like extension thus performs the function of a force transmission element which transmits forces between the frame part and the brake caliper.
[0011] The web-shaped extension is in particular formed in one piece with the frame part. This makes handling and assembly particularly simple. However, multi-component production is also conceivable.
[0012] At least one web-like extension can extend at least partially between the housing and the brake caliper. Thereby, the web-like extension is covered by the housing. In particular, the housing can thereby be manufactured without additional holes, thereby avoiding the penetration of dust and moisture into the actuator subassembly.
[0013] According to one embodiment, at least one web-like extension is fixed radially and axially to the brake caliper by means of fixing means which protrude in radial direction through the housing or through the brake caliper. This is advantageous for assembly, since the housing and the brake caliper are easily accessible radially from the outside. If the fixing means extends through the housing, the additional advantage is achieved that the housing is also fixed to the brake caliper simultaneously with the frame part.
[0014] The fixing means are, for example, screws.
[0015] A recess can be provided in the brake caliper, in which the sliding actuating member is guided in an axially displaceable manner, wherein at least one web-like extension extends into the recess. This contributes to a stable support of the frame part on the brake caliper. In particular, not only is the torque transmitted to the brake caliper via the at least one fixing device, but the web-like extension can also be additionally supported on the brake caliper by its side edge.
[0016] According to one embodiment, an anti-torsion element is arranged on the circumferential surface of the sliding actuation member, which anti-torsion element slides along the inner side of the web-shaped extension in the case of axial displacement of the sliding actuation member and is guided on the web-shaped extension in a torsion-resistant manner. Therefore, the web-shaped extension not only performs the function of a force transmission element, but also performs the function of guiding the anti-torsion element. Therefore, a separate guide for preventing torsion can be omitted, whereby the construction of the actuator subassembly is less complicated.
[0017] According to one embodiment, the frame part can be supported on the brake caliper in a torsionally fixed manner by means of a torsion-fixing geometry which is arranged on the inner wall of the frame part and faces the receiving space. Due to this torsion-fixing geometry, the torque transmission between the frame part and the brake caliper is additionally improved. In addition, the transverse forces acting on the web-shaped extension are also reduced, so that the web-shaped extension can be made narrower than without the torsion-fixing geometry.
[0018] An example of a torsionally rigid geometry is a wedge-shaped shaft geometry.
[0019] Alternatively or additionally, a planar abutment surface, in particular a wedge-shaped surface, can be provided on the brake caliper, and a corresponding surface bearing on the abutment surface can be provided on the web-shaped extension. The abutment surface can also be used to prevent twisting of the frame part on the brake caliper, so that torque is also transmitted from the frame part to the brake caliper via the abutment surface.
[0020] The frame part can have a fastening interface for the electric motor. Since the frame part is used not only to accommodate the gear mechanism unit but also to fasten the electric motor, a particularly compact actuator subassembly is achieved.
[0021] The gear mechanism unit comprises, for example, a planetary gear mechanism. This also contributes to a compact actuator subassembly.
[0022] The force transmission element is preferably made of a material that is stronger than the material from which the housing is made. Thus, the force transmission element can transmit sufficiently high forces and prevent material failure.
[0023] For example, the force transmission element is made of a metallic material.
[0024] The housing is made of, for example, a plastic material. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Other advantages and features of the present invention will be understood from the following description and the accompanying drawings with reference to them. In the drawings:
[0026] Figure 1 An actuator subassembly according to the present invention is shown,
[0027] Figure 2 Shows Figure 1 The frame portion of the actuator subassembly,
[0028] Figure 3 Shows Figure 1 A partial cross-sectional view of the actuator subassembly of the brake caliper,
[0029] Figure 4 Shows Figure 1 A cross section of the actuator subassembly in the region of the web-like extension,
[0030] Figure 5 A portion of an actuator subassembly according to another embodiment of the present invention is shown in an exploded view.
[0031] Figure 6 Shows Figure 5 The frame portion of the actuator subassembly,
[0032] Figure 7 Shows Figure 6 A cross section through some of the subassemblies,
[0033] Figure 8 shows the torsion-resistant geometry between the frame part and the brake caliper, and
[0034] Fig. 9 A recess of a brake caliper is shown with a sleeve arranged in the recess and a sliding actuating member guided in the sleeve. DETAILED DESCRIPTION
[0035] Figure 1 A vehicle brake is shown having an actuator subassembly 12. The vehicle brake 10 is an electromechanically actuated brake.
[0036] The actuator subassembly 12 comprises a brake caliper 14 in which an intermediate space 16 for a brake rotor is formed. For the sake of clarity, the brake rotor is not shown in the drawings.
[0037] A brake pad 18 which can be applied to a brake rotor is arranged in the intermediate space.
[0038] Furthermore, the actuator subassembly 12 includes a spindle drive 20, which in the exemplary embodiment is a ball screw drive, having a rotatably supported electric drive spindle 22 on which a sliding actuation member 24 is supported. The spindle 22 is used to move the sliding actuation member 24 in an axial direction.
[0039] In particular, the sliding actuation member may be displaced by means of an axial displacement between an extended position and a retracted position.
[0040] The sliding actuation member 24 represents in particular a spindle nut.
[0041] The actuator subassembly 12 also includes an electric motor which is not visible in the figure. For example, the electric motor is arranged in parallel with the spindle drive 20.
[0042] The electric motor is drivingly coupled to the slide actuation member 24 through the gear mechanism unit 26 and the spindle drive 20 so as to displace the slide actuation member 24 between the retracted position and the extended position.
[0043] In the exemplary embodiment, the gear mechanism unit 26 includes a planetary gear mechanism 27 .
[0044] The axial displacement of the sliding actuating member 24 is mainly achieved by the rotation of the main shaft 22 .
[0045] A recess 28 is formed in the brake caliper 14, on which a running surface 30 for sliding the actuating member 24 is formed (see FIG. Figure 3 ).
[0046] The sliding actuating member 24 is guided axially in the running surface 30 , in particular in a rotationally fixed manner.
[0047] The spindle 22 of the spindle drive 20 is supported on the side facing away from the sliding actuating member 24 via an axial bearing 32 on a wall 34 which extends transversely with respect to the direction of movement of the sliding actuating member 24 .
[0048] The gear mechanism unit 26 is accommodated in the housing 36 .
[0049] A plate-shaped frame portion 38 is additionally arranged in the housing 36. Figure 2 shown.
[0050] The frame part 38 has a receiving space 40 for receiving at least one gear stage of the gear mechanism unit 26. In particular, the planetary gear mechanism 27 is at least partially accommodated in the receiving space 40.
[0051] The receiving space 40 is in particular a cylindrical space. In other words, the wall of the receiving space 40 is cylindrical.
[0052] The frame part 38 furthermore has a fastening interface 42 for the electric motor.
[0053] from Figure 1 and Figure 2 3, it can be seen that, starting from the frame part 38, two web-like extensions 44 extend in the direction of the brake caliper 14. In this case, the web-like extensions 44 extend partially between the brake caliper 14 and the housing 36.
[0054] The number of web-like extensions may vary, for example, the frame portion 38 may have only one or as many as four web-like extensions 44 .
[0055] The web-like extension 44 is formed integrally with the frame portion 38 .
[0056] Figure 1 It is shown that the web-like extension 44 is fixed to the brake caliper 14 .
[0057] In particular, the web-like extension 44 is radially and axially fixed to the brake caliper 14 by means of a fixing device 46 which protrudes through the brake caliper 14 in the radial direction.
[0058] In the exemplary embodiment, the fixing means 46 are screws.
[0059] Due to the fastening to the brake caliper 14 , the web-like extension 44 forms in each case a force transmission element, which transmits axial forces and torques from the frame part 38 to the brake caliper 14 , thereby avoiding loads on the housing 36 .
[0060] In such Figure 1 In the illustrated embodiment of the actuator subassembly 12 , the web-like extension 44 extends into the recess 28 of the brake caliper 14 .
[0061] from Figure 3 It can be seen that Figure 3 The brake caliper 14 is shown, which for this purpose has a hole 48 in the direction of the recess 28 .
[0062] Furthermore, the recess 50 in which the web-shaped extension 44 is located extends along the running surface 30 .
[0063] like Figure 1 and Figure 4 As shown, which shows a cross section through the actuator subassembly 12 , the torsion resistance of the sliding actuation member 24 is produced by one of the web-like extensions 44 .
[0064] In particular, an anti-torsion element 52 is arranged on the circumference of the sliding actuation member 24, which abuts against the web-like extension 44 and is guided in a torsionally fixed manner on the web-like extension 44. During the axial displacement of the sliding actuation member 24, the anti-torsion element 52 slides along the inner side of the web-like extension 44.
[0065] In an embodiment not shown in the figures for the sake of clarity, the recess 50 is formed in such a way that the web-like extension 44 can be received in a torsionally fixed manner in the recess 50. In this way, the torque can be better transmitted from the frame part 39 to the brake caliper 14.
[0066] exist Figures 5 to 7 , an alternative embodiment of the actuator subassembly 12 is shown, wherein Figure 5 A partial subassembly of the actuator subassembly 12 is shown, surrounding the brake caliper 14 , the housing 36 , and the plate-like frame portion 38 .
[0067] In contrast to the above-described embodiment, in this embodiment the web-shaped extension 44 is configured to be shorter and does not extend into the recess 28 .
[0068] like Figure 5 As shown, the brake caliper 14 is formed with a planar abutment surface 54 which may be in the form of a wedge-shaped surface.
[0069] On the web-shaped extension 44, a corresponding abutment surface 56 is provided which bears on the abutment surface 54 (see Figure 6 and Figure 7 ).
[0070] In this case, the extension 44 extends between the brake caliper 14 and the housing 36 .
[0071] like Figure 7 As shown, at its end face 58 , the web-shaped extension 44 abuts against the brake caliper 14 .
[0072] In accordance with Figures 5 to 7 In the embodiment of , the radial and axial fixing to the brake caliper 14 is achieved by means of fixing means 46 which protrude through the housing 36 in the radial direction and which are also screws.
[0073] exist Figure 8 In the further embodiment shown, an additional torsion-proof geometry 60 arranged on the inner wall of the receiving space 40 can be provided between the frame part 38 and the brake caliper 14 .
[0074] The torsion-proof geometry 60 is, in particular, a wedge-shaped shaft geometry.
[0075] In this case, a suitably corresponding geometry is provided on the brake caliper 14 .
[0076] In the above-described embodiments, in each case there is a recess 28 in the brake caliper 14 , in which the sliding actuation member 24 is received and on which the running surface 30 for the sliding actuation member 24 is provided.
[0077] However, it is also conceivable to accommodate a sleeve 62 in the recess 28, the inner wall of which is formed the running surface 30. Fig. 9 , Fig. 9 The brake caliper 14 is shown with a corresponding sleeve 62. Such a sleeve 62 may be used in all of the actuator subassemblies 12 described above.
[0078] If a sleeve 62 is present, a geometry corresponding to the rotationally fixed geometry 60 can also be provided on the sleeve 62 .
Claims
1. An actuator subassembly (12) for a brake (10), in particular an electric vehicle brake, the actuator subassembly having A brake caliper (14) having an intermediate space (16) for accommodating a brake rotor, a spindle drive (20) having a sliding actuation member (24) for applying a brake pad (18) to the brake rotor and an electric drive spindle (22) for axially moving the sliding actuation member (24), an electric motor, the electric motor being drivingly coupled to the main shaft (22) via a gear mechanism unit (26), a housing (36) in which the gear mechanism unit (26) is accommodated, and a plate-shaped frame part (38) having a receiving space (40) for receiving at least one gear stage of the gear mechanism unit (26) and also arranged in the housing (36), in, Starting from the frame part (38), at least one web-shaped extension (44) extends in the direction of the brake caliper (14) and is fixed to the brake caliper (14).
2. The actuator subassembly (12) according to claim 1, characterized in that The at least one web-like extension (44) extends at least partially between the housing (36) and the brake caliper (14).
3. An actuator subassembly (12) according to any one of the preceding claims, characterized in that The at least one web-like extension (44) is axially and radially fixed to the brake caliper (14) by means of a fixing device (36) which protrudes in a radial direction through the housing (36) or through the brake caliper (14).
4. An actuator subassembly (12) according to any one of the preceding claims, characterized in that A recess (28) is provided in the brake caliper (14), in which the sliding actuation member is guided in an axially displaceable manner, wherein the at least one web-like extension (44) extends into the recess (28).
5. The actuator subassembly (12) according to claim 4, characterized in that An anti-torsion element (52) is arranged on the circumferential surface of the sliding actuating member (14), and the anti-torsion element (52) slides along the inner side surface of the web-shaped extension (44) in the event of axial displacement of the sliding actuating member (14) and is guided on the web-shaped extension (44) in a torsion-proof manner.
6. An actuator subassembly (12) according to any one of the preceding claims, characterized in that The frame part (38) is supported on the brake caliper (14) in a rotationally fixed manner by means of a torsion-proof geometry (60), which is arranged on an inner wall of the frame part (28) which faces toward the receiving space (40).
7. An actuator subassembly (12) according to any one of the preceding claims, characterized in that A planar abutment surface (54), in particular a wedge-shaped surface, is provided on the brake caliper (14), and a corresponding surface (56) bearing against the abutment surface (54) is provided on the web-shaped extension (44).
8. An actuator subassembly (12) according to any one of the preceding claims, characterized in that The frame part (38) has a fastening interface (42) for the electric motor.
9. An actuator subassembly (12) according to any one of the preceding claims, characterized in that The gear mechanism unit (26) includes a planetary gear mechanism (27).